Question

please tell how to do it​

Answer 1

$\huge\bf\underline{\underline{ Given:-}}$

• $\bf initial \: velocity , u = 20 m/s$
• $\bf final \: velocity , v = 0$
• $\bf distance \: travelled = 10 cm = 0.1 m$

$\huge\bf\underline{\underline{To \: Find:-}}$

• retardation

$\huge\bf\underline{\underline{Formulas \: Used:-}}$

$\boxed{\bf\red{ v² = u² + 2as }}$

$\huge\bf\underline{\underline{ Answer :-}}$

By using the formula ,

$\bf\red{{v}^{2} = {u}^{2} + 2as}$

$\bf0 = {20}^{2} + 2 \times a \times 0.1$

$\bf \: 0= 400 + 0.2a$

$\bf \: a \: = \frac{ - 400}{0.2}$

$\bf \: \: \: \: = - 2000 \: m {s}^{ - 2}$

$\bf \: since \: it \: \: is \: \: retardation , a = 2000 m/s²$